i have a predisposition to never want any spiders or morphs

[Eric Alan]

so my whole idea of "bad breeders produce bad spiders for $$$" is just in my head?

Resoundingly YES.

is there such a thing as "bad" spider morphs?

Yes, but not for the reasons associated with the Spider quirks you're thinking about. There are some UGLY Spider morphs out there - I'd say they were "bad".